Cluster feeding advice FTM help

Hi ladies, my baby is 4 days old and we’ve been home for 2days and both nights baby has cluster fed. Literally gone from one to the other breast. Last night she fed for 70 mins and was still hungry. Is this normal? In the end my partner gave her abit of formula as I was tired and abit sore and she was sickly till early morning. Any advice please would be appreciated. I really want to persist with breastfeeding but I’m exhausted and unsure how long this will go on for 🤷🏽‍♀️